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June 05, 2007

Water is pumped for miles, sometimes hundreds of miles, from its source to 90% of U.S. homes. This takes an enormous amount of energy; in California, it represents the single largest use of energy statewide. ... [continue reading]

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June 01, 2007

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May 06, 2007

Q I live in a 1920s Wardman row house in Washington, D.C. The house has a cast-iron radiator heating system. I hired a local contractor to do some bathroom renovations. It was necessary to ... [continue reading]

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March 20, 2007

For an increasing number of Californians, renewable energy is an obvious choice. Harnessing the earth’s own inexhaustible energy—whether from the sun, wind, biomass, or other renewable sources—can reduce dependence ... [continue reading]

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March 10, 2007

Solar PV is becoming an increasingly popular option for generating electricity in urban and suburban homes. Three years ago Niels Wolter of Madison, Wisconsin, installed a 1.3 kW PV system on his family’s three-bedroom ... [continue reading]